Near space usually refers to the earth space with a height of about 20-100 km. It is a highly interdisciplinary field involving atmospheric physics, space physics, plasma physics, photochemistry, solar and geosciences, Geosciences and life sciences. The development and utilization of near space is far less than that of traditional airspace and satellite orbital space. Near space usually corresponds to areas where traditional airplanes are difficult to fly and satellites are not easy to detect. Compared with the middle and lower atmosphere and higher ionosphere and outer space, there has been a lack of systematic and efficient observers in the near space for a long time. Objectively, near space has become a weak point of human's understanding of the whole earth's space.
With the development of high-speed digital system, high-speed serial data transmission is widely used and the FPGA containing high-speed serial transceiver is also widely used. The high-speed serial interface of Xilinx's FPGA includes GTP, GTX, GTH and other high-speed transceivers with different transmission rate. The physical transmission speed of these transceivers can reach tens of Gbps. These low-level high-speed transceivers can support a variety of top-level transmission protocols, such as SRIO, PCIE, SATA, optical fiber and so on. Among these top-level transmission protocols, optical fiber transmission has the longest transmission distance and is widely used in various scenarios. Optical fiber transmission has three advantages. Firstly, its transmission capacity is very large and it can support ultralong distance transmission, one line optical fiber transmission rate can easily reach several Gbps. Secondly, optical fiber communication has strong anti-electromagnetic interference characteristics, which can ensure the quality of data transmission. Thirdly, optical fiber transmission uses light wave for data transmission and the light wave transmitted in the optical fiber cannot run out, so there is no radiation and it is difficult to eavesdrop.
KEYWORDS: Digital signal processing, Field programmable gate arrays, Logic, Image sensors, Clocks, Cameras, Image processing, Real time image processing, Data conversion, Image transmission
In the real-time image processing system, SRIO was used to meet the demands of massive data interacting capacity between FPGA and DSP. This paper realized the massive image data transmission between FPGA and DSP with SRIO. The image sensor outputs image data in 4 channels and the clock in each channel is 175MHz, five times of input clock. Since the data channel is double data rate, so the data rate of one channel is 350Mbps, the data rate of the whole image sensor is 1400Mbps. FPGA receives the sampled data from image sensor and reorganizes the image data, and then transmits the organized data to camera link interface for display testing on the one hand; on the other hand, FPGA transmits the sorted data to DSP via SRIO for further process. The SRIO transmission between FPGA and DSP uses x1 mode, 8b/10b coding, and the transmission rate is 2.5Gbps per lane. The result shows that the image in camera link interface is fine and the SRIO transmission is successful.
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